If 16 key chains cost cost $19.68 how much do 25 key chains cost

2 answers:

6 0

We know how much 16 keychains is, now we need to find how much one is.

19.68 / 16 = $1.23

$1.23 is the price of one keychain, now you can multiply that by 25 to see how much 25 keychains cost.

bazaltina [42]3 years ago

4 0

To get the cost for 1 key chain, divide $19.68 by 16.
$19.68 / 16 = $1.23

Multiply by 25 to see how much 25 key chains would cost.
25 * $1.23 = $30.75

25 key chains would cost $30.75

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If y varies directly with x when y=1/3 and x = 12, find x if y is 4.

Nikitich [7]

Answer:

x = 144

Step-by-step explanation:

y α x

we introduce a constant 'k' when changing from α to =.

i.e y = kx

y = ⅓ when x = 12

Meaning, ⅓ = k * 12

⅓ = 12k

k = ⅓ ÷ 12

k = 1/36

If y = 4, x = ?

using the equation y = kx

4 = (1/36)x

x = 4 ÷ (1/36)

x = 4 * 36

x = 144

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